CN1272656C - Planar light source structure - Google Patents
Planar light source structure Download PDFInfo
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- CN1272656C CN1272656C CNB021540829A CN02154082A CN1272656C CN 1272656 C CN1272656 C CN 1272656C CN B021540829 A CNB021540829 A CN B021540829A CN 02154082 A CN02154082 A CN 02154082A CN 1272656 C CN1272656 C CN 1272656C
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- light source
- guide plate
- light guide
- light
- flat
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Abstract
The present invention relates to a planar light source structure which comprises a light source and a light guide plate, wherein the light guide plate is provided with a steering surface, and light emitted by the light source which is arranged on the surface of one end of the light guide plate is guided out in a subvertical mode. The light guide plate is made of two kinds of materials with different refraction factors, and the steering surface is arranged between the materials with different refraction factors. The present invention is provided with a wedge type light guide plate which is provided with two kinds of materials with different refraction factors, and the steering surface of the wedge type light guide plate is arranged between the two kinds materials with different refraction factors.
Description
Technical field
The present invention relates to a kind of flat light source structure, particularly relate to the wedge type light guide plate that a kind of flat light source structure has the material of two kinds of different optical refractive index.
Background technology
In many display device, need flat light source, for example LCD or scanner.Major part is a pointolite in conventional lighting sources, for example light emitting diode or incandescent lamp bulb.And some light source is a wire, for example the cold cathode fluorescent tube.Use flat light source if desired, a kind of mode is that top pointolite is arranged in array, or the line source that forms a line.Yet the electricity wasting that this mode is not only suitable is for also being quite disadvantageous in the consideration of cost.
A kind of mode that forms flat light source is to use light guide plate (light guide plate).Shown in Figure 1A and Figure 1B, present most light guide plate is respectively wedge type (wedge) plate 10 or dull and stereotyped 20.No matter be the wedge type plate of Figure 1A or the flat board of Figure 1A, all light guide plate all are that the light source 12,22 that will be positioned at end surfaces imports light guide plate 10,20, utilize V-type tangent plane or site that light source is up derived again.At present, many improvement are arranged,, use a water chestnut mirror to be positioned on the light guide plate to prevent directly to see that from light source light improves the uniformity coefficient of light as the notification number patent 20020005991 that the U.S. has announced for the wedge type light guide plate shown in Figure 1A.
Yet, in any case the resulting flat light source of this dual mode still has inborn shortcoming.At first, shown in the wedge type plate 10 of Figure 1A, the brightness of light source 12 concentrates on 1/3rd light guide plate length parts near light source 12 usually, has the problem of light source left and right sides uniformity coefficient inequality.In addition, shown in Figure 1B, use the flat light guide plate 20 of two light sources 22, though can reduce the problem of light source left and right sides uniformity coefficient, it is minimum being positioned at light guide plate 20 middle brightness.
The mode that another solves the light source uniformity coefficient as shown in Figure 2, is proposed by Fujitsu, mainly provides a kind of light conducting plate structure of hollow type.Light earlier through lens 32, then by the specific refraction condition of the specific conditioned reflex of two lens 34 and two control strips 36, is directed to light via lens combination 38 panel of LCD again after both sides light source 30 emission.In addition, add that in the bottom in two saturating borders 34 two reflector plates 40 are to increase brightness.Yet the flat light source structure of this complexity not only can increase difficulty and cost in the manufacturing, also can reduce the qualification rate when making simultaneously.
Summary of the invention
In above-mentioned background of invention, traditional many shortcomings that flat light source produced, the main purpose of the present invention has been to provide the wedge type light guide plate of the material of two kinds of different optical refractive index, make light in the wedge type light guide plate, can reduce the loss of luminous energy in the process, and then improve the brightness of flat light source structure.
Another object of the present invention is to increase the serviceable life of flat light source structure.
Another purpose of the present invention is to hollow out in the middle of will the wedge type light guide plate reducing the loss of luminous energy, and then the brightness that improves the flat light source structure.
A further object of the present invention is to alleviate the weight of flat light source structure.
The object of the present invention is achieved like this, and a kind of flat light source structure promptly is provided, and comprising: a light source; An and light guide plate, be hollow structure, and the steering surface with a V-type tangent plane structure turns to derivation in order to the light that this light source sent that will be positioned at this light guide plate one end surfaces in subvertical mode, wherein the inner filling one of the hollow of this light guide plate is different from the packing material of this light guide plate refraction coefficient, this steering surface is between this packing material and this light guide plate, and light is mainly passed through in this packing material.
The present invention also provides a kind of flat light source structure, comprising: a light source; An and light guide plate, be hollow structure, and the steering surface with a V-type tangent plane structure turns to derivation in order to the light that this light source sent that will be positioned at this light guide plate one end surfaces in subvertical mode, and wherein the part that is diverted except light in the light of this light guide plate inside is passed through the path is empty.
More particularly, according to the above difficulty purpose, a kind of flat light source structure provided by the invention comprises a light source and a wedge type light guide plate.Aforesaid wedge type light guide plate has the light that light source sent that a steering surface will be positioned at aforesaid wedge type light guide plate one end surfaces and turns to derivation in subvertical mode, the material of wherein aforesaid wedge type light guide plate comprises the material of two kinds of different optical refractive index, and aforesaid steering surface is between the material of these two kinds of different optical refractive index.Above-mentioned steering surface has the structure of V-type tangent plane.
It is one that above-mentioned wedge type light guide plate is positioned at the optical refractive index of being derived the material of direction with light, and above-mentioned flat light source structure comprises that a reflecting surface is positioned on the aforementioned steering surface further to increase the brightness of aforementioned flat light source structure.
The light that above-mentioned light source sent in aforementioned wedge type light guide plate through the material of aforementioned two kinds of different optical refractive index one of them.
Above-mentioned shape light-source structure comprises that a reflecting surface is positioned at the direction that aforesaid wedge type light guide plate is derived with respect to light, and comprises that the site is between aforementioned reflecting surface and aforementioned wedge type light guide plate.In addition, above-mentioned light source can be cold cathode fluorescent tube or light emitting diode.
Description of drawings
Figure 1A is a kind of traditional flat light source structural representation with wedge type light guide plate;
Figure 1B is a kind of traditional flat light source structural representation with flat light guide plate;
Fig. 2 is the flat light source structural representation with hollow type light guide plate of Fujitsu;
Fig. 3 is the synoptic diagram of a preferred embodiment of a hollow type wedge type light guide plate of the present invention;
Fig. 4 is another the tangent plane synoptic diagram of preferred embodiment of a hollow type wedge type light guide plate of the present invention;
Fig. 5 is the tangent plane synoptic diagram of the another preferred embodiment of a hollow type wedge type light guide plate of the present invention;
Fig. 6 is another the tangent plane synoptic diagram of preferred embodiment of a hollow type wedge type light guide plate of the present invention, and wherein the light guide plate material on the light source next door is removed;
Fig. 7 is another the tangent plane synoptic diagram of preferred embodiment of a hollow type wedge type light guide plate of the present invention, and wherein the light guide plate material on the light source next door is replaced by diffusion water chestnut mirror; And
Opticpath synoptic diagram when Fig. 8 is the illegal body of wedge type light in uneven thickness.
Embodiment
Some embodiments of the present invention can be described in detail as follows.Yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, its with after claim be as the criterion.
The present invention mainly provides a kind of flat light source structure, comprises a light source and a wedge type light guide plate.Above-mentioned wedge type light guide plate has a V-type tangent plane structure steering surface and turns to derivation in order to the light that light source sent of the end surfaces that will be positioned at aforementioned wedge type light guide plate in subvertical mode, wherein aforementioned wedge type light guide plate inside comprises the material of one first optical refractive index and the material of one second optical refractive index, the material of aforementioned first optical refractive index is positioned at the material of aforementioned second optical refractive index, aforementioned steering surface is between the material of the material of aforementioned first optical refractive index and one second optical refractive index, and light is mainly passed through in the aforementioned first optical refractive index material.
The optical refractive index of the material of above-mentioned first optical refractive index is one, and above-mentioned flat light source structure comprises that one is positioned at reflecting surface on the aforementioned steering surface further to increase the brightness of aforesaid flat light source structure.Above-mentioned flat light source structure comprises a reflecting surface being positioned on the direction that aforementioned wedge type light guide plate derived with respect to light, and comprises the site between aforementioned reflecting surface and aforementioned wedge type light guide plate.In addition, above-mentioned light source can be cold cathode fluorescent tube or light emitting diode.
Next, the embodiment of a flat light source structure is described according to the present invention.As shown in Figure 3, the wedge type light guide plate 100 of a hollow, its steering surface 104 is designed to the V-type tangent plane makes light by the end surfaces light source 102 of the wedge type light guide plate panel via steering surface 104 guiding LCD.Light source 102 used herein can be cold cathode fluorescent tube or light emitting diode.The wedge type light guide plate 100 of hollow can not inserted any material.This expression light without any medium, thereby reduces luminous energy via light energy losses that medium caused in the route major part of passing through of light guide plate inside.Simultaneously, the weight of whole flat light source module also can reduce, and this lightweight for light source module has greatly and benefits.Moreover therefore the brightness that the loss of minimizing luminous energy has also improved the flat light source module simultaneously can reduce the consumed power of light source, and also can increase the serviceable life of light source.
Fig. 4 is according to the embodiment of Fig. 3 and further improved tangent plane synoptic diagram.The end surfaces of the wedge type light guide plate 100 of hollow is a light source 102, and the V-type tangent plane structure that the surface structure of steering surface 104 is exaggerated.In this embodiment, in light is directed to the filter 106 of LCD, can add diffusion water chestnut mirror, and can form reflectance coating on the surface of steering surface 104 to increase the brightness of illumination of flat light source.
Fig. 5 is according to the embodiment of Fig. 3 and further improved tangent plane synoptic diagram.Can add that in the bottom of hollow type wedge type light guide plate 100 reflection horizon 108 is to increase the brightness of illumination of flat light source.Between reflection horizon 108 and wedge type light guide plate 100, can design site 110 to promote the optical uniformity of flat light source.The embodiment shown in Figure 5 use of can arranging in pairs or groups with embodiment shown in Figure 4.
In above-mentioned several embodiment, the medium between hollow type wedge type light guide plate and the light source 102 can be hollowed out, as shown in Figure 6.Light almost is without any medium at the Lu Jingzhong of wedge type light guide plate like this.Embodiment shown in Figure 6 can with Fig. 5 or the embodiment shown in Figure 4 use of arranging in pairs or groups.In addition, as shown in Figure 7, add that at the side of light source 102 a diffusion water chestnut mirror 112 to adjust the cross drive of light in the wedge type light guide plate, also provides wedge type light guide plate good supporting simultaneously.The use of diffusion water chestnut mirror 112 also can remedy the shadow phenomenon at cold cathode fluorescent tube two ends simultaneously.Here except using diffusion water chestnut mirror 112, also can use the site to adjust the cross drive of light in the wedge type light guide plate in same place.
Yet vacuum or air are the medium that wherein a kind of light is propagated in fact, and its optical index is 1.Therefore, in hollow type wedge type light conducting plate structure of the present invention, the part that is hollowed out can be inserted other transparent material, as long as it is different with the optical refractive index of light guide plate to insert the optical refractive index of material.The purpose of inserting material is to provide the wedge type light guide plate a preferable support.But, the weight of the material of inserting not too dense timber can reduce the weight of wedge type light guide plate, and light is not too big through dissipation of energy in wherein.
In the present invention, the wedge type light conducting plate body can be designed to uneven thickness.As shown in Figure 8, when angle δ 3 was not equal to angle δ 4, the light light-5 behind superrefraction can be utilized to light-7.Thereby the brightness that further improves flat light source.
The present invention utilizes different optical refractive index media as the goodish advantage of truly having of wedge type light guide plate.When being that particularly one of them medium is vacuum or air, light can reduce the loss of luminous energy in the process in the wedge type light guide plate, and then improves the brightness of flat light source structure, also increases the serviceable life of flat light source structure.In addition, the wedge type light guide plate of hollow can alleviate the weight of flat light source structure.
The above is preferred embodiment of the present invention only, is not in order to limit the present invention; Allly do not break away from the equivalence finished under the disclosed spirit at other and change or modify, all should be included in the following claim.
Claims (12)
1. flat light source structure comprises:
One light source; And
One light guide plate, be hollow structure, and the steering surface with a V-type tangent plane structure turns to derivation in order to the light that this light source sent that will be positioned at this light guide plate one end surfaces in subvertical mode, wherein the inner filling one of the hollow of this light guide plate is different from the packing material of this light guide plate refraction coefficient, this steering surface is between this packing material and this light guide plate, and light is mainly passed through in this packing material.
2. flat light source structure as claimed in claim 1 comprises that also a reflecting surface is positioned on this steering surface further to increase the brightness of this flat light source structure.
3. flat light source structure as claimed in claim 1, wherein above-mentioned light guide plate are the wedge type light guide plate.
4. flat light source structure as claimed in claim 3 comprises that also a reflecting surface is positioned at the direction that this hollow wedge type light guide plate is derived with respect to light.
5. flat light source structure as claimed in claim 4 comprises that also the site is between this reflecting surface and this wedge type light guide plate.
6. flat light source structure as claimed in claim 1, wherein above-mentioned light source is selected in the group that cold cathode fluorescent tube and light emitting diode are formed.
7. flat light source structure comprises:
One light source; And
One light guide plate, be hollow structure, and the steering surface with a V-type tangent plane structure turns to derivation in order to the light that this light source sent that will be positioned at this light guide plate one end surfaces in subvertical mode, and wherein the part that is diverted except light in the light of this light guide plate inside is passed through the path is empty.
8. flat light source structure as claimed in claim 7 comprises that also a reflecting surface is positioned on this steering surface further to increase the brightness of this flat light source structure.
9. flat light source structure as claimed in claim 8, wherein above-mentioned light guide plate are the wedge type light guide plate.
10. flat light source structure as claimed in claim 9 comprises that also a reflecting surface is positioned at the direction that this hollow wedge type light guide plate is derived with respect to light.
11. flat light source structure as claimed in claim 10 comprises that also the site is between this reflecting surface and this wedge type light guide plate.
12. flat light source structure as claimed in claim 7, wherein above-mentioned light source is selected in the group that cold cathode fluorescent tube and light emitting diode are formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB021540829A CN1272656C (en) | 2002-12-10 | 2002-12-10 | Planar light source structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB021540829A CN1272656C (en) | 2002-12-10 | 2002-12-10 | Planar light source structure |
Publications (2)
Publication Number | Publication Date |
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CN1506728A CN1506728A (en) | 2004-06-23 |
CN1272656C true CN1272656C (en) | 2006-08-30 |
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CNB021540829A Expired - Fee Related CN1272656C (en) | 2002-12-10 | 2002-12-10 | Planar light source structure |
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CN (1) | CN1272656C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100454048C (en) * | 2005-03-29 | 2009-01-21 | 统宝光电股份有限公司 | Light guide plate and backlight module assembly |
WO2010138765A1 (en) | 2009-05-29 | 2010-12-02 | Qualcomm Mems Technologies, Inc. | Illumination devices and methods of fabrication thereof |
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2002
- 2002-12-10 CN CNB021540829A patent/CN1272656C/en not_active Expired - Fee Related
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CN1506728A (en) | 2004-06-23 |
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